单项选择题
Demulsibility of a lube oil is defined as （）.
A.the ability of oil to separate from water
B.the temperature at which oil flows rapidly
C.a measure of the water in a lube oil system
D.an emulsion of different grades of oil
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相关考题
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单项选择题
When subjected to high heat from a open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?（）
A.CO2
B.Methyl chloride
C.R-22
D.Sulphur dioxide -
单项选择题
Which of the following terms is used to identify the pressure of the liquid entering a pump?（）
A.Suction head
B.Pump head
C.Discharge head
D.Total head -
单项选择题
Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however （）.
A.toxic
B.flammable
C.explosive
D.all of the above
